Commit Graph

4 Commits

Author SHA1 Message Date
Joseph Myers
f58e5f4809 Use libm_alias_ldouble in sysdeps/x86_64/fpu.
This patch continues the preparation for additional _FloatN / _FloatNx
function aliases by using libm_alias_ldouble for sysdeps/x86_64/fpu
long double functions, so that they can have _Float64x aliases added
in future.

Tested for x86_64, including build-many-glibcs.py tests that installed
stripped shared libraries are unchanged by the patch.

	* sysdeps/x86_64/fpu/e_expl.S: Include <libm-alias-ldouble.h>.
	[USE_AS_EXPM1L] (expm1l): Define using libm_alias_ldouble.
	* sysdeps/x86_64/fpu/s_ceill.S: Include <libm-alias-ldouble.h>.
	(ceill): Define using libm_alias_ldouble.
	* sysdeps/x86_64/fpu/s_copysignl.S: Include
	<libm-alias-ldouble.h>.
	(copysignl): Define using libm_alias_ldouble.
	* sysdeps/x86_64/fpu/s_fabsl.S: Include <libm-alias-ldouble.h>.
	(fabsl): Define using libm_alias_ldouble.
	* sysdeps/x86_64/fpu/s_floorl.S: Include <libm-alias-ldouble.h>.
	(floorl): Define using libm_alias_ldouble.
	* sysdeps/x86_64/fpu/s_fmaxl.S: Include <libm-alias-ldouble.h>.
	(fmaxl): Define using libm_alias_ldouble.
	* sysdeps/x86_64/fpu/s_fminl.S: Include <libm-alias-ldouble.h>.
	(fminl): Define using libm_alias_ldouble.
	* sysdeps/x86_64/fpu/s_llrintl.S: Include <libm-alias-ldouble.h>.
	(llrintl): Define using libm_alias_ldouble.
	(lrintl): Likewise.
	* sysdeps/x86_64/fpu/s_nearbyintl.S: Include
	<libm-alias-ldouble.h>.
	(nearbyintl): Define using libm_alias_ldouble.
	* sysdeps/x86_64/fpu/s_truncl.S: Include <libm-alias-ldouble.h>.
	(truncl): Define using libm_alias_ldouble.
	* sysdeps/x86_64/x32/fpu/s_lrintl.S: Include
	<libm-alias-ldouble.h>.
	(lrintl): Define using libm_alias_ldouble.
2017-11-17 23:39:11 +00:00
Joseph Myers
26b0bf9600 Avoid "inexact" exceptions in i386/x86_64 ceil functions (bug 15479).
As discussed in
<https://sourceware.org/ml/libc-alpha/2016-05/msg00577.html>, TS
18661-1 disallows ceil, floor, round and trunc functions from raising
the "inexact" exception, in accordance with general IEEE 754 semantics
for when that exception is raised.  Fixing this for x87 floating point
is more complicated than for the other versions of these functions,
because they use the frndint instruction that raises "inexact" and
this can only be avoided by saving and restoring the whole
floating-point environment.

As I noted in
<https://sourceware.org/ml/libc-alpha/2016-06/msg00128.html>, I have
now implemented a GCC option -fno-fp-int-builtin-inexact for GCC 7,
such that GCC will inline these functions on x86, without caring about
"inexact", when the default -ffp-int-builtin-inexact is in effect.
This allows users to get optimized code depending on the options they
pass to the compiler, while making the out-of-line functions follow TS
18661-1 semantics and avoid "inexact".

This patch duly fixes the out-of-line ceil function implementations to
avoid "inexact", in the same way as the nearbyint implementations.

I do not know how the performance of implementations such as these
based on saving the environment and changing the rounding mode
temporarily compares to that of the C versions or SSE 4.1 versions (of
course, for 32-bit x86 SSE implementations still need to get the
return value in an x87 register); it's entirely possible other
implementations could be faster in some cases.

Tested for x86_64 and x86.

	[BZ #15479]
	* sysdeps/i386/fpu/s_ceil.S (__ceil): Save and restore
	floating-point environment rather than just control word.
	* sysdeps/i386/fpu/s_ceilf.S (__ceilf): Likewise.
	* sysdeps/i386/fpu/s_ceill.S (__ceill): Save and restore
	floating-point environment, with "invalid" exceptions merged in,
	rather than just control word.
	* sysdeps/x86_64/fpu/s_ceill.S (__ceill): Likewise.
	* math/libm-test.inc (ceil_test_data): Do not allow spurious
	"inexact" exceptions.
2016-06-27 17:24:30 +00:00
Joseph Myers
9c84384cc1 Remove trailing whitespace. 2013-06-05 20:44:03 +00:00
Andreas Jaeger
19c33b6ecc Update.
2003-11-13  Andreas Jaeger  <aj@suse.de>

	* sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_TGKILL):
	Define appropriately for x86_64.
	(__ASSUME_UTIMES): Likewise.
	(__ASSUME_FADVISE64_64_SYSCALL): Likewise.
	(__ASSUME_CLONE_THREAD_FLAGS): Likewise.

	* sysdeps/x86_64/fpu/s_ceill.S: New file.
2003-11-13 16:41:19 +00:00